contrib/make_sunver.pl

   1 #!/usr/bin/perl -w
   2
   3 # make_sunver.pl
   4 #
   5 # This script takes at least two arguments, a GNU style version script and
   6 # a list of object and archive files, and generates a corresponding Sun
   7 # style version script as follows:
   8 #
   9 # Each glob pattern, C++ mangled pattern or literal in the input script is
  10 # matched against all global symbols in the input objects, emitting those
  11 # that matched (or nothing if no match was found).
  12 # A comment with the original pattern and its type is left in the output
  13 # file to make it easy to understand the matches.
  14 #
  15 # It uses elfdump when present (native), GNU readelf otherwise.
  16 # It depends on the GNU version of c++filt, since it must understand the
  17 # GNU mangling style.
  18
  19 use FileHandle;
  20 use IPC::Open2;
  21
  22 # Input version script, GNU style.
  23 my $symvers = shift;
  24
  25 ##########
  26 # Get all the symbols from the library, match them, and add them to a hash.
  27
  28 my %sym_hash = ();
  29
  30 # List of objects and archives to process.
  31 my @OBJECTS = ();
  32
  33 # List of shared objects to omit from processing.
  34 my @SHAREDOBJS = ();
  35
  36 # Filter out those input archives that have corresponding shared objects to
  37 # avoid adding all symbols matched in the archive to the output map.
  38 foreach $file (@ARGV) {
  39     if (($so = $file) =~ s/\.a$/.so/ && -e $so) {
  40         printf STDERR "omitted $file -> $so\n";
  41         push (@SHAREDOBJS, $so);
  42     } else {
  43         push (@OBJECTS, $file);
  44     }
  45 }
  46
  47 # We need to detect and ignore hidden symbols.  Solaris nm can only detect
  48 # this in the harder to parse default output format, and GNU nm not at all,
  49 # so use elfdump -s in the native case and GNU readelf -s otherwise.
  50 # GNU objdump -t cannot be used since it produces a variable number of
  51 # columns.
  52
  53 # The path to elfdump.
  54 my $elfdump = "/usr/ccs/bin/elfdump";
  55
  56 if (-f $elfdump) {
  57     open ELFDUMP,$elfdump.' -s '.(join ' ',@OBJECTS).'|' or die $!;
  58     my $skip_arsym = 0;
  59
  60     while (<ELFDUMP>) {
  61         chomp;
  62
  63         # Ignore empty lines.
  64         if (/^$/) {
  65             # End of archive symbol table, stop skipping.
  66             $skip_arsym = 0 if $skip_arsym;
  67             next;
  68         }
  69
  70         # Keep skipping until end of archive symbol table.
  71         next if ($skip_arsym);
  72
  73         # Ignore object name header for individual objects and archives.
  74         next if (/:$/);
  75
  76         # Ignore table header lines.
  77         next if (/^Symbol Table Section:/);
  78         next if (/index.*value.*size/);
  79
  80         # Start of archive symbol table: start skipping.
  81         if (/^Symbol Table: \(archive/) {
  82             $skip_arsym = 1;
  83             next;
  84         }
  85
  86         # Split table.
  87         (undef, undef, undef, undef, $bind, $oth, undef, $shndx, $name) = split;
  88
  89         # Error out for unknown input.
  90         die "unknown input line:\n$_" unless defined($bind);
  91
  92         # Ignore local symbols.
  93         next if ($bind eq "LOCL");
  94         # Ignore hidden symbols.
  95         next if ($oth eq "H");
  96         # Ignore undefined symbols.
  97         next if ($shndx eq "UNDEF");
  98         # Error out for unhandled cases.
  99         if ($bind !~ /^(GLOB|WEAK)/ or $oth ne "D") {
 100             die "unhandled symbol:\n$_";
 101         }
 102
 103         # Remember symbol.
 104         $sym_hash{$name}++;
 105     }
 106     close ELFDUMP or die "$elfdump error";
 107 } else {
 108     open READELF, 'readelf -s -W '.(join ' ',@OBJECTS).'|' or die $!;
 109     # Process each symbol.
 110     while (<READELF>) {
 111         chomp;
 112
 113         # Ignore empty lines.
 114         next if (/^$/);
 115
 116         # Ignore object name header.
 117         next if (/^File: .*$/);
 118
 119         # Ignore table header lines.
 120         next if (/^Symbol table.*contains.*:/);
 121         next if (/Num:.*Value.*Size/);
 122
 123         # Split table.
 124         (undef, undef, undef, undef, $bind, $vis, $ndx, $name) = split;
 125
 126         # Error out for unknown input.
 127         die "unknown input line:\n$_" unless defined($bind);
 128
 129         # Ignore local symbols.
 130         next if ($bind eq "LOCAL");
 131         # Ignore hidden symbols.
 132         next if ($vis eq "HIDDEN");
 133         # Ignore undefined symbols.
 134         next if ($ndx eq "UND");
 135         # Error out for unhandled cases.
 136         if ($bind !~ /^(GLOBAL|WEAK)/ or $vis ne "DEFAULT") {
 137             die "unhandled symbol:\n$_";
 138         }
 139
 140         # Remember symbol.
 141         $sym_hash{$name}++;
 142     }
 143     close READELF or die "readelf error";
 144 }
 145
 146 ##########
 147 # The various types of glob patterns.
 148 #
 149 # A glob pattern that is to be applied to the demangled name: 'cxx'.
 150 # A glob patterns that applies directly to the name in the .o files: 'glob'.
 151 # This pattern is ignored; used for local variables (usually just '*'): 'ign'.
 152
 153 # The type of the current pattern.
 154 my $glob = 'glob';
 155
 156 # We're currently inside `extern "C++"', which Sun ld doesn't understand.
 157 my $in_extern = 0;
 158
 159 # We're currently inside a conditional section: just skip it.
 160 my $in_ifdef = 0;
 161
 162 # The c++filt command to use.  This *must* be GNU c++filt; the Sun Studio
 163 # c++filt doesn't handle the GNU mangling style.
 164 my $cxxfilt = $ENV{'CXXFILT'} || "c++filt";
 165
 166 # The current version name.
 167 my $current_version = "";
 168
 169 # Was there any attempt to match a symbol to this version?
 170 my $matches_attempted;
 171
 172 # The number of versions which matched this symbol.
 173 my $matched_symbols;
 174
 175 open F,$symvers or die $!;
 176
 177 # Print information about generating this file
 178 print "# This file was generated by make_sunver.pl.  DO NOT EDIT!\n";
 179 print "# It was generated by:\n";
 180 printf "# %s %s %s\n", $0, $symvers, (join ' ',@ARGV);
 181 printf "# Omitted archives with corresponding shared libraries: %s\n",
 182     (join ' ', @SHAREDOBJS) if $#SHAREDOBJS >= 0;
 183 print "#\n\n";
 184
 185 while (<F>) {
 186     # End of skipped section.
 187     if (/^[ \t]*\#endif/) {
 188         $in_ifdef = 0;
 189         next;
 190     }
 191
 192     # Just skip a conditional section.
 193     if ($in_ifdef) { next; }
 194
 195     # Lines of the form '};'
 196     if (/^([ \t]*)(\}[ \t]*;[ \t]*)$/) {
 197         $glob = 'glob';
 198         if ($in_extern) {
 199             $in_extern--;
 200             print "$1##$2";
 201         } else {
 202             print;
 203         }
 204         next;
 205     }
 206
 207     # Lines of the form '} SOME_VERSION_NAME_1.0;'
 208     if (/^[ \t]*\}[ \tA-Z0-9_.a-z]+;[ \t]*$/) {
 209         $glob = 'glob';
 210         # We tried to match symbols agains this version, but none matched.
 211         # Emit dummy hidden symbol to avoid marking this version WEAK.
 212         if ($matches_attempted && $matched_symbols == 0) {
 213             print "  hidden:\n";
 214             print "    .force_WEAK_off_$current_version = DATA S0x0 V0x0;\n";
 215         }
 216         print; next;
 217     }
 218
 219     # Special comments that look like C preprocessor conditionals.
 220     # Just skip the contents for now.
 221     # FIXME: Allow passing in conditionals from the command line to really
 222     # control the skipping.
 223     if (/^[ \t]*\#ifdef/) {
 224         $in_ifdef = 1;
 225         next;
 226     }
 227
 228     # Comment and blank lines
 229     if (/^[ \t]*\#/) { print; next; }
 230     if (/^[ \t]*$/) { print; next; }
 231
 232     # Lines of the form '{'
 233     if (/^([ \t]*){$/) {
 234         if ($in_extern) {
 235             print "$1##{\n";
 236         } else {
 237             print;
 238         }
 239         next;
 240     }
 241
 242     # Lines of the form 'SOME_VERSION_NAME_1.1 {'
 243     if (/^([A-Z0-9_.]+)[ \t]+{$/) {
 244         # Record version name.
 245         $current_version = $1;
 246         # Reset match attempts, #matched symbols for this version.
 247         $matches_attempted = 0;
 248         $matched_symbols = 0;
 249         print;
 250         next;
 251     }
 252
 253     # Ignore 'global:'
 254     if (/^[ \t]*global:$/) { print; next; }
 255
 256     # After 'local:', globs should be ignored, they won't be exported.
 257     if (/^[ \t]*local:$/) {
 258         $glob = 'ign';
 259         print;
 260         next;
 261     }
 262
 263     # After 'extern "C++"', globs are C++ patterns
 264     if (/^([ \t]*)(extern \"C\+\+\"[ \t]*)$/) {
 265         $in_extern++;
 266         $glob = 'cxx';
 267         # Need to comment, Sun ld cannot handle this.
 268         print "$1##$2\n"; next;
 269     }
 270
 271     # Chomp newline now we're done with passing through the input file.
 272     chomp;
 273
 274     # Catch globs.  Note that '{}' is not allowed in globs by this script,
 275     # so only '*' and '[]' are available.
 276     if (/^([ \t]*)([^ \t;{}#]+);?[ \t]*$/) {
 277         my $ws = $1;
 278         my $ptn = $2;
 279         # Turn the glob into a regex by replacing '*' with '.*', '?' with '.'.
 280         # Keep $ptn so we can still print the original form.
 281         ($pattern = $ptn) =~ s/\*/\.\*/g;
 282         $pattern =~ s/\?/\./g;
 283
 284         if ($glob eq 'ign') {
 285             # We're in a local: * section; just continue.
 286             print "$_\n";
 287             next;
 288         }
 289
 290         # Print the glob commented for human readers.
 291         print "$ws##$ptn ($glob)\n";
 292         # We tried to match a symbol to this version.
 293         $matches_attempted++;
 294
 295         if ($glob eq 'glob') {
 296             my %ptn_syms = ();
 297
 298             # Match ptn against symbols in %sym_hash.
 299             foreach my $sym (keys %sym_hash) {
 300                 # Maybe it matches one of the patterns based on the symbol in
 301                 # the .o file.
 302                 $ptn_syms{$sym}++ if ($sym =~ /^$pattern$/);
 303             }
 304
 305             foreach my $sym (sort keys(%ptn_syms)) {
 306                 $matched_symbols++;
 307                 print "$ws$sym;\n";
 308             }
 309         } elsif ($glob eq 'cxx') {
 310             my %dem_syms = ();
 311
 312             # Verify that we're actually using GNU c++filt.  Other versions
 313             # most likely cannot handle GNU style symbol mangling.
 314             my $cxxout = `$cxxfilt --version 2>&1`;
 315             $cxxout =~ m/GNU/ or die "$0 requires GNU c++filt to function";
 316
 317             # Talk to c++filt through a pair of file descriptors.
 318             # Need to start a fresh instance per pattern, otherwise the
 319             # process grows to 500+ MB.
 320             my $pid = open2(*FILTIN, *FILTOUT, $cxxfilt) or die $!;
 321
 322             # Match ptn against symbols in %sym_hash.
 323             foreach my $sym (keys %sym_hash) {
 324                 # No?  Well, maybe its demangled form matches one of those
 325                 # patterns.
 326                 printf FILTOUT "%s\n",$sym;
 327                 my $dem = <FILTIN>;
 328                 chomp $dem;
 329                 $dem_syms{$sym}++ if ($dem =~ /^$pattern$/);
 330             }
 331
 332             close FILTOUT or die "c++filt error";
 333             close FILTIN or die "c++filt error";
 334             # Need to wait for the c++filt process to avoid lots of zombies.
 335             waitpid $pid, 0;
 336
 337             foreach my $sym (sort keys(%dem_syms)) {
 338                 $matched_symbols++;
 339                 print "$ws$sym;\n";
 340             }
 341         } else {
 342             # No?  Well, then ignore it.
 343         }
 344         next;
 345     }
 346     # Important sanity check.  This script can't handle lots of formats
 347     # that GNU ld can, so be sure to error out if one is seen!
 348     die "strange line `$_'";
 349 }
 350 close F;